Single-band Hubbard model for superconductivity and charge-density-wave order in the bismuth oxide superconductors

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.13098· OSTI ID:5967113

Chancey, C C ^[1]; Ramakumar, R ^[2]; Jain, K P ^[3]

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1. Department of Physics and Chemistry, Purdue University Calumet, Hammond, Indiana 46323-2094 (United States)
2. Department of Physics, Amherst College, Amherst, Massachusetts 01002 (United States) Department of Physics, Indian Institute of Technology, New Delhi 110016 (India)
3. Department of Physics, Indian Institute of Technology, New Delhi 110016 (India)

A model is developed for superconducting and charge-density-wave (CDW) correlations in the bismuth oxide superconductors BaPb[sub 1[minus][ital x]]Bi[sub [ital x]]O[sub 3] and Ba[sub 1[minus][ital x]]K[sub [ital x]]BiO[sub 3], starting from the Hubbard model and assuming a three-dimensional tight-binding band structure. Self-consistent equations for the superconducting gap ([Delta]), and the CDW gap ([ital g]), and the band filling ([ital N][sub [ital e]]) are derived and solved numerically. Solutions for both [Delta] and [ital g] are obtained for 0.29[le][ital N][sub [ital e]][le]0.38 and 0.80[le][ital N][sub [ital e]][le]1.00 (where [ital N][sub [ital e]]=1.00 represents half-filling). These solutions are compared against the experimental data for BaPb[sub 1[minus][ital x]]Bi[sub [ital x]]O[sub 3] and Ba[sub 1[minus][ital x]]K[sub [ital x]]BiO[sub 3] and qualitative agreement is obtained.

• OSTI ID: 5967113
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:17; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
CHARGE DENSITY
CORRELATIONS
CRYSTAL MODELS
ELECTRONIC STRUCTURE
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
LEAD COMPOUNDS
LEAD OXIDES
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
SUPERCONDUCTORS